Seiki spent 25 years with the Chase Manhattan Bank and held several senior management positions in New York, Singapore, Hong Kong and San Francisco. In his last position, he was a Senior Vice President of the Bank and President of the Chase Manhattan Trust Company of California. In other assignments, Seiki was Asia Pacific Area Executive for private banking based in Hong Kong where he was responsible for overseeing more than $6 billion in client assets and managed the sales, credit, trust and investment management functions. Seiki was also Southeast Asia Regional Manager for consumer and private banking, and ran Chase's credit card operation in the region.

Seiki transferred to San Francisco in 1993 to manage Chase Manhattan Private Bank in the western United States.

After leaving Chase, Seiki became Chairman of the Board of the Millennium Bank in San Francisco. He is currently on the Board of directors of SynZyme Technologies, a biotech company located in Irvine, CA, and of Millennium Capital, a Shanghai-based investment bank.

Seiki is a graduate of Franklin and Marshall College and holds an MBA from the American University.